Assuming you trade a lot and are a daytrader and use binance, coinbase and all those exchanges, you need your coins on the exchange to trade. But when you are done with trading that day, do majority of traders just leave their coins there till the next day? Now if you are trading it with USD, then no issue then right since the balance would be USD or a portion of your balance is in USD?
It may depend on how the trader itself.
But commonly, they will make it in stable coins in order to ease their day trading activities. It will be also more stable if we are saving the assets in stable coins if we are for day trading. Stable coins are not only USDT but others that may be available in the exchanges. We can choose one of them as our best choice. ANd if we let them in the wallet before converting to the bank or even convertig to other assets for long term investment, Ithink that stable coin really makes sense to be used.
If you are doing this with coins like ETH, you are going to pay a ton of fees each way. Your exchange is going to charge you a fee and you going to pay a decent fee sending it back the next day. Now imagine having many other altcoins where the fees are similar. I can' t imagine people are depositing/withdrawing each day?
We will only be charged a fee if we make transactions, both buying and selling or withdrawing. So if we just leave it in the form of ETH, it won't be charged. It's just that the movement of the ETH value may continue to change. So sometimes the assets in the wallet will easily go up and down